Drilling mechanism



April 16, 1929. c. F. OSGOOD DRILLING MECHANISM .MU F,

'Patented Apr.^16,1929. r

UNITED t STATESl PATENT OFFICE.

CHARLES r. osGooD, oF GLARRMONT, `NEW HAMPSHIRE, AssIeNoR'mo SULLIVAN MA- CHINERY COMPANY, A CORPORATION or MASSACHUSETTS.

DRILLING MRCHANISM.

Application..inedY May24, 1923. serial Np. 641,095.`

My invention relates to drilling mechanisms, and more particularly to controlling,

devices for fluid pressure rock drills of the percussive type. p A.

. An object of my invention is to provide an improved drilling` mechanism.. Another object Vof my invention is to provide an nnproved controlling device for fluid pressure rock drills. A further objectof my invention is to provide an improved controlling .device for fluid pressure rock drills ofthe percussive type whereby the rotation mechanism automatically kcontrolsthe speed of the hammer piston. A still further object of my invention is tol provide an improved con. trolling device responsive to the resistance kto rotation for automatically varying the flow ofpressure Huid to the drilling motor. Other objects and advantages of my invention will hereinafter more fully appear.

In the accompanying drawingsA I have shown for purposesof'illustration oneform which my invention may assume in practice. l

, In these d ravvings,- k

Fig.v 1 is a central longitudinal section, partially in elevation, of a stoper drill incorporating my improved device. y l

Fig. 2 is a transverse section taken sub- Y stantially on line 2-2 of Fig. 1.v

In the illustrative form of my invention I have shown a stoper drill of standardv form including a drilling motor 1r anda'feeding mechanism 2. of the valveless percussive type, comprises a vcylinder 3 having a piston 4 reciprocable in a bore 5 therein, adapted percussively to actu ate,.herein through a tappet, a drill steel 6 carried in a chuck 7 -in the front end of the drilling motor. The feeding mechanism 2 comprises a feed cylinder 8 having a piston 9 disposed therein and having suitably se;

' cured thereto a piston rod 10 terminating in a. point 11. Int-,erposed between the motor 1 and the feeding mechanism 2 is a head block 12 having a bore 13 therein forming a continuation of the bore 5 inthe cylinder 3, the feed cylinder, head block, and drilling motor parts being suitablyl held together by side rods 12',V in a Well knovvnmanner. Suitably secured in the head blockv12 is also a handle 14 employed to support'the machine and to prevent the machine from bodily rotating about its axis during the drilling operation. 1

The drilling motor 1, herein- An independentfluid pressure actuated roi meshing With a gear 21 formed on the chuck '7. Fluid pressure is supplied to themachine through a throttle valve 22 arranged in a boss formed on thehead block 12, rfrom anyj suitable source of supply,and passes 4through a port 23ito the feed cylinder 8a passage 24 to a constant pressure chamber 25,*a port 26 to the rotation motor 15, and a port 27, under thecontrol of an automatic control valve 28, vto the ,drilling motor 1.` The automatic control valve 28 comprises a conical, or tapered,

head 29, havinga cut-away portion or slot 30 1n its .tapered side so that When the valve is seated a sufiicient amount of fluid may pass to bring the piston 4 up to drilling speed during normal conditions. At the opposite end of the valve 2S isa piston head 31 movable vin a pressure tight chamber 32', Which is closed by` a plug through which eX- 'tends a'folloWer 34 adapted to adjust the pressure on a spring 35 acting on the val-ve '28 and tendingtomove it to open position. By changing the-pressure on this spring auf,7 desired speed of the'nrotor is obtained, but this Will bel constant with different air pressures. On the other side of the piston head 531iv the chamber 30 is vented to the atmosphere by Way of port 36. A passage .37 also Y extends from the'rotation motor to the pressurechainber During normal drilling the line pressure in the 'chamber 25A overcomes the force exerted by the fluid vpressure and the spring pressure in the chamber 32,- and the vpressure in the motor casing is materially less than the main line pressure yin chamber .25 because of the speed of the rotation motor and the relative sizeof the port 24, so that the fluid vpressure acting on the head 31 is comparatively light. The typev of-automatic control valve shown is used for illustrative purposes only, the particular type of` valve used being immaterial.

Themode. of operation of my invention Will be clearly apparent in view of the description given. The point 11` is placed against an abutment a suitable dist-ancefrom same and increase its power.

Cal

to the point desired when the machine is opl erating normally. If a soft spot is encomitered, tending tostick the drill steel, an additional load is placed on the rotation motor 15, cutting down its speed, and the press-ure on the admission-side ofthe motoris thereby increased, vthus increasing the pressure at the right of the piston Vhead 81 and opening Wide the valve 2S and admitting more pressure fluid to the drillino" motor vby way of port 27 in such manner to speedup the Variations `in the load on the motor l5 and itsetfect on the speed produce variations in pressure in the admission side of the motor l5 and .the po sition of the valve 28 is accordingly automatically varied, increasing or decreasing the amount of pressure fluid admitted to the v drilling motor as needed. lVhen the drill steel again rotates freely, the valve 28 automatically returns to its initial position, the pressure dropping in chamber 32 as the rotation motor again speeds'up. As the drill steel 6 deepens the hole, it is of course fed forward.

lVhile I have in this application specifically described one form which my invention may assume in practice, it will be understood that this form of the same is shown for purposes of illustration and that t-lie invention may be modified and embodied in various other forms without departing from its spirit or the scope of tlie'appended claims.

lVhat I claim as new and desire to secure vby Letters Patent is:

l. In combination, work performing means including a tool actuating motor of the reciprocating hammer piston type,a tool actuated thereby, and means responsive to the changes of'load on said tool for automatically controlling said reciprocating motor, said automatic'means being operative to increase the power of said tool actuating motor as the load on said tool increases.

2, In combination, a pressure fluid actuated inotor of the reciprocating hammer pis- 'ton type, a tool actuated thereby, means forI supplying actuating fluid to said motor, and

means for automatically controlling the fluid flow-to said motor in accordance with the nature of the Work encountered by said tool, said automatic means being operative to increase the flow .of fluid to said reciprocating motor as the working load on said tool increases. i

3. In combination, work performing means including a pressure fluid actuated percussive motor, a tool actuated thereby,v

type, a tool actuated thereby, and means automatically controlled by one of said motors `for controllingl the speed of said other motor, said automatic means being operative to increase the speed of said hammer motor when the speed of said other motor is decreased.V

5. In combination, a cutting tool, work performing means including a. reciprocating motor of the hammer piston type for imparting movement to said tool, and means responsive to the resist-ance to movement of said tool for automatically controlling said motor, said automatic means being operative to increase the power of said reciprocating motor as the resistance to movement ofsaid tool is increased. i

6. In combination, a cutting tool, work performing means including a reciprocating 4motor of the hammer piston type for imparting motion to said tool, and means responsive to an increased resistance to movement of said tool for automatically increasing the power of said reciprocating motor.

7. In combination, a tool actuating motor of the hammer type, a tool actuated thereby, and meansfor automatically controlling the speed of said tool actuating motor in accordance with Vthe nature of the work encountered by said tool, said automatic means being ope"ative to increase the speed of said hammer motor as Vthe werking load on said tool increases.

' 8. In combination, a tool actuating motor, a Vtool actuated thereby, a motor for' rotating said tool, and mea-ns automatically confi i) 10. In combination, a tool actuating motor, a tool actuated thereby, means :for rotating said tool, and means automatically responsive to the resistance to rotation for ting said steel, means for supplying pressure fluid to said motor, and means responsive to the resistance to rotation of said ydrill steel for automatically controlling the pres- ,sure fluid supply to said drilling motor,

said automatic means being operative to increase the supply of pressure Huid to said drilling motor as the resistance to drill steel rotation increases.

12. In combination, a drilling motor, a drill steel actuated. thereby, `means for rotating said drill steel, and means to automatically increase the speed oit said drilling motor whenthe speed of said rotation is decreased.'

13. In combination, a drilling motor coniprising a cylinder and a piston reeiprocable therein, a drill steel actuated by said piston, means for rotating said drill steel', `and means automaticallyv effective upon variations in speed ol said rotation means for if'arying the speed of said piston, said automatic means being operative to increase the speed ot' said piston when the speed of said rotation means is decreased.

14. In combination, a drilling motor comprising a cylinder and a piston reciprocable therein, a drill steel actuated thereby, means for rotating said drill steel., and means automatically controlled vby said rotating means for controlling the speed of said drilling motor, said automatic means being operative to increase the speed 01' said drilling motor when the speed of said rotating means decreased.

- 15. In combination, work performing means including a. percussive motor and a rotary motor, and means automatically responsive" to the load changes on one of said motors ior controlling,theoperation oft the other, said automatic means being operativeY to increase the speed ott said percussive motor when `'the speed ol said rotary motor is decreased.

16. In com bination, a drilling motor ot' the hamm-er type, a tool actuated thereby, a motor :tor rotating said tool,and means automatically responsive to the load changes on one of said. motors for controlling the operation of the other, said automatic. means'being operative to increasefthe powerot said drilling motor as the load on said tool rotating motor increases. f

17. In combination, work performing means including a tool actuating motor hav- 'ing a reciprocable hammer piston, a. tool tuated thereby, and means tor automatically f controlling the speed of said hammer piston .in accordance with the nature el the Werl;

encountered by said tool, said automatic means being operative to increase the speed of said tool actuating motor as the working load on said tool increases.

18. In combination, a drilling` motor ol the hammer type, a tool actuated thereby, an independent motor for rotating said tool,

Aand means to auton'iatically control said drilling motor controlled by said tool rotating motor, said automatic means being Operative to increase the power of said drilling motor as the load on said rotating motor increases.

Y 19. In combination, work performing means including a plurality of tool actuating motors, one of which is oft the hammer type, a tool actuated thereby, and means automatically responsive to the operation of one of said motors for controlling said other motor, said automatic means beingv operative to increase the speed ot vsaid hammer motorwhen the speed ot said other motor is decreased.

20. In combination, a tool actuating motor, altool actuated thereby, a pressure fluid actuatedrotation motor for said tool, Asaid latter motor having a fluid supply communieating therewith, and means for automatically controlling said tool actuating motor including a valvel having opposed pressure surfaces, and. means for subjecting` said suraces'to the pressure fluid in said rotation motor and said liuid supply respectively.

` 21. In combination, a drilling motor of the hammer type, a drill steel actuatefl thereby, a drill steel rotation motor of the inter'- as the load on said tool rotating motor increases.

- Inl testimony whereof I aitix my signature.

CHARLES F. OSGOOD. 

